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  1. D

    Is this allowed as i could not find an answer in the wiring regs.

    4 core, 10mm SWA cable feeding a trace heating installation. The Installer has stated he wants to use 2 cores as 2 phases and 2 cores as Neutrals. This means the cable will have 2 separate circuits within. This would be acceptable if installed within conduit, but is this classed as bad practice...
  2. MarkySparky1962

    Definitive answer please - EICR

    Morning All Please can someone provide me a definitive answer to matters pertaining EICR As a NICEIC Domestic Installer I hold C&G 2392, 2393, and my 18th Ed. I’m keen for this thread not to descend into a 5 day pay as you go wonder v 90 years on the tools indented apprentices how very dare...
  3. stephen fenton

    Can't seem to find the answer, 18th edition tommorow ; )

    A circuit with a 10mm 70*C thermoplastic copper live conductor has a maximum final temperature of 160*C. If a fault current of 600A flows through the conductor, the time taken to reach the final temperature would be.... ? got all the rest just cant seem to locate this one! cheers in advance.:)
  4. S

    I'm sure there is an easy answer!

    All I want to do is sell coffee!! In short ... I've had a mid life crisis and bought a catering van. It has a full size domestic fridge onboard. I need to keep milk cold from home to event site. I'll hook up at home and chill fridge till I leave. Am planning on using an inverter to keep fridge...
  5. P

    What's the answer to this problem?

    There's been a few posts on here recently regarding poor workmanship on installations. Some have said it should be illegal for anyone other than a qualified and registered electrician to carry out wiring and testing. While I agree with this to a certain extent, how would it be enforced? Anyone...
  6. V

    2365-305 C

    Fail first exam. Any suggestions what kind of material to study to pass next time. Maybe text books? I found swindon massive and spark website but exams there is with answers a b c d. 305 C is written exam. No answers are given. I think you can pass only with practice the exam with similar...
  7. T

    Why do desktop power supplies and GPU's keep blowing?

    I'm not an electrician but I some clever heads together - http://www.electriciansforums.co.uk/threads/im-not-an-electrician-but-i-some-clever-heads-together.117521/ Some of you may remember the above thread where the guy had umpteen blown power supplies and GPU go into melt down. I have now been...
  8. darkwood

    Brain busters

    Right guys and girls, I'm kickstarting a thread that asks what appear to be quite simple to moderately complicated questions within the realms of what we observe daily to science and space. These questions are designed to initially seem simple in solution, that is until you actually start...


    Thank you for accepting me to forum. I studying to my Inspection and Testing exam which is already on Saturday. Any advices??? LOL
  10. B

    Maximum disconnection times

    Hi does anyone know max disconnection times on tn-s system for: 16A radial 6A lights 32A distribution Cheers
  11. PLW

    What is the difference between Electric Charge and Electric Current

    I understand that electric current is the flow of charge or electrons. would I be right in saying that electric charge is the ability of matter to experience force, such as attract and repulsion.
  12. N

    Introduction & Advice wanted

    Good afternoon, I've currently got a metal and plastic recycling facility, we normally just take in plastics but are licensed for metals. We've recently recieved some transformers to be recycled, from what I know, 500KVA Dry transformers, they weigh about 1500kg each and I've got 3 with all...
  13. W

    Worried Student

    Hi, I am currently doing a Level 3 City and Guilds course in Electrical Installation, I have a written exam next week and really need some help, if I fail I will lose my job, my past exams have all been multiple choice questions. I would be most grateful for any help or advice. Thank you
  14. J

    Do you need an earth rod for an outbuilding?

    Do i need an earth rod if i am running a supply to a shed/outbuilding ? The incoming supply to the house is tnc-s
  15. D

    Too many calls!

    I was wandering what people do when they're busy as hell and have phone call after phone call from potential customers. Do you stop what your doing, answer every call possible and arrange visits for quotes until all your evenings are booked up for the next few weeks? not to mention all the time...
  16. S

    Commercial Fuse rating

    Hello I have a question , when looking at a cartridge fuse that say's , 32A (32SB3) , and at the side it says 550V AC 80kA ( BS88.2 ) , can this be used as a 32A on 240V supply ! . SpotBot
  17. N

    17th edition exam

    About to take my 17th edition exam and when I did the 16th edition is was on old fashioned paper (who remembers that). Am I correct in assuming that within the 2 hours I can go back and forth to any questions I have answered to check them and if necessary change the answer. Also do I get the...
  18. R

    Rcd protection on adding 1 light

    Just a quick one. I have added an LED floodlight off an existing light on an outside wall and the circuit is not rcd protected. Do I need to fit an rcbo on the circuit or not. The cable is clipped direct through a loft space.
  19. R

    BS7671 Amendment Question (Regarding Shower Rooms & Tests)

    Hi all, long time no see! So I have this question that I need to answer for an assignment but there is an issue. I have a copy of the BS7671 Wiring Regs Amendment 3 (which has amendment 1 & 2 removed from the introduction). Question 1 asks : Which zone no longer applies to a shower room? The...
  20. G

    Pv on rcd

    Hi guys doing a solar iboost as a subby the other day and noticed that the Pv supply had been connected to a shared RCD, situation was TT supply feeding 2 dbs at the origin each with a 30mA main switch RCD. I was always under the impression that this was incorrect but read through the Dti guide...
  21. S

    City and Guilds Assigment Help

    Hi everyone, I need serious help here I know theres a post on this before bit everyones answers seem wrong. I need someone who seriously knows what there on about, here is the question Propriety Fixings of the PVC Conduit I need a solid answer for this as I have college tomorrow thanks
  22. 8

    MFT 1720 up for sale

    Hi guys. As a regular user of this forum, I just though I would share the fact I have put my MFT 1720 on ebay, the terms on ebay are as shown, but however will consider ending auction for any sensible quick sale offers...
  23. A

    series and parallel combinations

    Hi all I am carrying out my assignment and a little stuck on this i have to work out the Total inductance and total capacitance now I'm aware of the formulas for series and parallel inductors and capacitors but as you can see from the picture i have a series/parallel combination and I'm...
  24. S

    Expected r1 r2 value when circuit 16.5m long

    Hi Guys stuck: A ring final circuit wired in 2.5/1.5 Resis: per m 7.41 and 12.1 what is the expected value of (r2+R2) the circuit is 16.5m long
  25. B

    2394 Multi Choice Mock Papers

    Hi Guys Sitting my multiply choice exam next tuesday. Any chance of any past papers or recommended sites? Any infomation would be much appreciated Many Thanks Stu
  26. K

    Fused spurs

    Hi all. Can anyone give me advise on fused spurs? I would like to know if it is ok to wire a FCU adjacent to a ring socket. Then run 2.5 t&e to say 5 double sockts and then add another FCU with a 3 amp fuse to run a 6ft fluresent fitting?Is this classed as a spur off a spur as i am aware that...
  27. D

    Crabtree c50 breakers

    Are these worth selling or just get rid? Saved from a recent mains change
  28. F

    Running conduit, attic

    Hi I am fitting conduit in my attic room ready for when i get it rewired so i can plaster up and have a finished room for the time being. I won't be running any wire. I have 2 x 20mm going up to a 35mm deep knockout where a dimmer switch will be located for a 3-way switch rig. Out of the top...
  29. L

    2394 question

    Hi I am due to start the city and guilds 2394 course next month. I thought that I would have a look at some past questions to see what to expect. I am having trouble with one of the questions and was wondering if anyone could explain the theory to me. 16) The measured value of loop...
  30. 1

    Shower feed wired in wrong

    I was wondering if anyone can answer this one for me. I'm an electricians mate, I did ask the guy I'm with but he couldn't give me an answer. So after he changed the board and I did the bonding I get to go round testing. Whilst taking the zs of the shower I noticed immediately upon removing...
  31. N

    Moving A Socket A Few Feet

    Client wants (indoor, domestic) socket moved a matter of a few feet, assuming cable is not to be buried in wall, would you say for regs compliance socket must be RCD protected? I know the answer is liable to be yes because it's adding a new socket and decommissioning the old, but just wanted to...
  32. ebow72

    CSCS Card RCD Question

    I am due my CSCS card renewal and have the revision disc and this quesiton came up, now I am either loosing my marbles or RCD's have changed their purpose since this disc came out. My answer was A, but they seem to think it's D. One that slipped through the net I reckon.
  33. I

    vectra battery light

    vectra 2.0l diesel 03 plate my brothers vectra the dials kept dropping and battery light flashing on , few weeks later it happened again and stayed on so he called out the RAC And the boy told him it was the alternator so he got one from the scrappys and got it fitted , a week later the same...
  34. R

    British gas etelephone interview

    Hi I have a telephone interview for British gas this Thursday for an electricians job with themselves it has been said I will be asked 6 technical questions from the regs book any ideas on what they will ask if anyone has had this interview would be so grateful for a reply as really want this...
  35. B

    Ring main fault

    Need help A property I recently done an EICR on has a fault on the downstairs ring main. The fault is an open circuit on the r1. To shorten the story I managed to believe the fault is under the floor and may have possible joint boxes. But the client has sold the property and didn't want to...
  36. H

    working in Canada

    Any sparks on here ever worked out in Canada?
  37. Majid Khan

    Insulation resistance testing

    Hi guys, Could anyone help me Please with the following questions? I have an assignment to do which has a question that states, Insulation resistance testing has been carried out on the installation and the following result obtained: Live to Live = 195 M ohms Live to earth = 0.75 M ohms...
  38. M

    Parallel cables

    Help with calculation please. If separate cable measure : 10Ω, 5Ω, 5Ω, 4Ω and 2Ω what would it be in parallel? I get this so far 1 1 1 1 1 1 = What happens next? 10 + 5 + 5 + 5 + 4 + 2
  39. P

    impulse withstand voltage

    Can anyone tell me what the minimum impulse withstand voltage is for a 500AMP BS88 fuse. I can only find up to 400A. Please only reply with the answer and not any rhetorical questions please. This is concerning surge protection devices. Thanks.
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